基于GIS/GPS/GPRS的公共服务车辆监控系统研究

公共服务车辆的有效管理和监控成为交通运输管理部门面临的一个重要课题.集成地理信息系统(GIS)、卫星定位系统(GPS)和通用分组无线服务技术(GPRS)等相关技术,设计基于GIS,GPS,GPRS的公共服务车辆监控系统的总体架构和功能,研究了开源GIS在公共服务车辆监控系统中的应用.以某地垃圾渣土车辆监控为例,实现了一个垃圾车辆监控系统,可为公共服务车辆监控系统建设和管理提供借鉴.     

CDMA/GPS车辆定位监控系统的优势及应用

介绍了CDMA/GPS车辆定位监控系统的基本原理及相关技术,通过对特定行业的相关调查,分析了CDMA/GPS车辆定位监控系统的优势及应用的前景。     

GPRS技术在车辆监控系统中的应用

结合GPRS网络特点,提出了用GPRS作为新一代GPS车辆监控通讯平台的观点.介绍了基于GPRS技术的车辆监控系统的组成、功能和实现的关键技术.该系统具有资源利用率高,数据传输速率快,收费合理等优点,在实际应用中取得了较好的效果.     

GPS车载终端监控管理设计与实现

根据车载终端监控管理这一发展需求,为实现车辆实时监控与调度管理,提出了车载终端监控管理系统总体结构和主要功能,设计并实现一款GPS车载终端监控管理系统.GPS车载终端监控管理系统由车载GPS监控终端、通信网络和调度监控中心三部分组成,以单片机控制技术和通讯模块为核心,实现车辆监控、调度管理、轨迹回放与报警管理等功能.该系统覆盖范围广、容量大、数据可靠性高,经过装车试验,具有很强的实用价值,应用效果良好.     

GPS技术在物流企业车辆监控系统中的应用

介绍了基于GPS、GIS的物流车辆监控系统，重点分析了系统的结构设计、工作流程，列举了目前物流车辆监控系统涉及到的主要技术，如地理信息系统（GIS）、全球定位系统（GPS）等。     

车辆管理中GPS监控系统的研究与应用

GPS车辆监控系统在我国车辆管理事业中具有重大的意义,对维护交通秩序、创建一体化的车辆管理系统有着科学的推动作用.本文通过充分分析GPS车辆监控系统建设的背景及构成阐述了GPS监控系统的特征及重要作用,并对其在应用中存在的弊端进行了必要的补充,对GPS监控系统在未来如何更加的人性化、智能化、经济化的发展有着重要的指导作用.     

全球定位系统(GPS)在道路运输领域的应用

GPS车辆监控调度系统融合了GPS、GIS以及GSM无线通信技术,能够实现对车、船等移动目标的精确定位、跟踪及控制.本文介绍了GPS在道路运输领域的一些基本应用.     

基于WEBGIS的网络GPS车辆监控系统设计

基于GPS车辆监控系统的应用,分析了GIS开发模式、WEBGIS技术优势,探讨了MAPXTREME JAVA的基本组成和工作原理.在此基础上,深入研究了基于MAPJAVA的4种WEBGIS开发技术.以城市安防监控WEBGIS系统为背景,提出了基于Internet框架的WEBGIS具体实现.该技术架构可以广泛应用于各类企业级WEBGIS系统构建.     

基于GPS和GPRS的车辆监控终端系统的设计

设计了一种集成GPS定位技术、GPRS通信技术和GIS地理信息技术于一体的车辆监控终端系统,可实现全天候GPS定位和车辆实时监控等功能。整个系统由车载端和监控中心两个部分组成。车载端以三星公司S3C2440处理器为开发平台,Linux作为嵌入式操作系统,主要负责GPS定位信息的采集。监控中心包括通信服务器、监控终端和数据库,其中通信服务器主要负责数据的接受、转发和存储,数据库主要负责数据的存储,配合监控终端进行车辆的调度监控。车载端和监控中心之间通过GPRS进行信息传输。     

基于北斗/GPS和GPRS的车载定位终端的研究与实现

为了实现对我国车辆更加有效的实时监控,本文设计了一种基于北斗/GPS和GPRS的车载定位终端,该终端由STC12C5A60S2单片机系统、无线数据通信模块、北斗/GPS卫星定位模块和温度传感器模块组成,利用北斗/GPS定位模块采集车辆位置信息,通过无线数据通信模块将采集到的数据传输到公网IP服务器上,并在终端显示器上显示当前系统工作状态及系统位置信息,以实现车辆位置信息的采集。仿真实验结果表明:该终端了实现车辆实时监控、温度监测和短信服务的功能;采用北斗/GPS联合定位模块,具有定位精度高,定位性能稳定的特点。同时,该终端首次冷启动定位时间35 s,热启动1 s,重捕获小于1 s,定位三维精度(RMS)3 m,速度精度0.1 m/s,这5项指标优于他人的研究成果,本研究达到了预期效果。该车载定位终端在车辆实时监控领域具有一定的应用潜力。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-